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Define th SI unit of electric current. (...

Define th SI unit of electric current. (or) What is one second in SI system of units? (or) Define one ampere (S.I standard for current)

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One ampere is the constant current, which when maintained in each of the two straight parallel conductors of infinite length and negligible cross section, held one metre apart in vacuum shall produce a force per unit length of `2 xx 10^(-7) N//m` between them.
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